gaucheadj.

Brit.

/ɡəʊʃ/, U.S.

/ɡoʊʃ/

Etymology: < French gauche skew, left (hand), left-handed, awkward.

1. Wanting in tact or in ease and grace of manner, awkward, clumsy.

ΚΠ

1751 Ld. Chesterfield Let. 10 May (1932) (modernized text) IV. 1729 Sir Charles Hotham is gauche; it is to be hoped that will mend with keeping company.

1806 J. Beresford Miseries Human Life I. x. 271 On going early to bed..finding..a gauche dawdle just beginning to introduce the warming-pan between the sheets.

1860 All Year Round 11 Feb. 363 He never does anything ludicrous, or gauche, or intrusive, or fussy, or vulgar.

a. Mathematics. Skew, not plane (see quot. 1879).

ΚΠ

1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §7 If various points of the line do not lie in one plane, we have in one case..a curve of double curvature, in the other a gauche polygon.

b. gauche perspective, that in which the surface of delineation is not a plane.

Derivatives

ˈgauchely adv.

ΚΠ

1891 Broughton & Bisland Widower indeed (1892) iii. 37 He enters gauchely, for he is a cub.

ˈgaucheness n.

ΚΠ

1883 My Trivial Life II. viii. 164 Never was more astonished than by Lady Arabella's gaucheness.

1936 W. H. Auden Look, Stranger! 55 O can you see precisely in our gaucheness The neighbour's strongest wish, to serve and love?

1937 Discovery July 226/1 Sixty-one excellent plates atone for any ‘gaucheness’ of the style.

1967 M. Wilding in Coast to Coast 1965–6 253 She liked him for his gaucheness.

Draft additions 1993

Chemistry. (Frequently italicized.) Characterized by, involving, or designating a staggered molecular conformation in which two particular atoms or groups are positioned in such a way that the dihedral angle between them is approximately 60°; also applied to a part of a molecule which is so positioned with respect to another specified part. Cf. trans- prefix 9a.

ΘΚΠ

the world > matter > chemistry > chemical structure or stereochemistry > [adjective] > of or relating to conformation

gauche1940

conformational1954

1940 Sci. Papers Inst. Physical & Chem. Res. (Tokyo) 37 213 It is probable that such a gauche form is subject to deformation more easily than the trans form which is more symmetrical.

1956 I. L. Finar Org. Chem. II. ii. 31 There are two positions of minimum energy, one corresponding to the trans configuration, and the other to the gauche configuration, the latter possessing approximately 1.1 kg.cal. more than the former.

1975 Nature 16 Oct. 566/2 The phosphorus nucleus giving rise to the highest-field signal shows small ³¹P-O-C-¹H coupling constants (< 5 Hz), consistent only with a conformation in which it is gauche to both 5′ protons.

1976 Lowry & Richardson Mechanism & Theory in Org. Chem. ii. 72 In an alkane, gauche interactions may raise the enthalpy content of the molecule.

1986 M. Rigby et al. Forces between Molecules viii. 187 For hydrocarbons Flory has suggested that A_ij can be estimated from the experimental value of the energy difference between the trans and gauche conformational isomers of the chain.

This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2022).

单词	gauche
释义	gaucheadj. Brit. /ɡəʊʃ/, U.S. /ɡoʊʃ/ Etymology: < French gauche skew, left (hand), left-handed, awkward. 1. Wanting in tact or in ease and grace of manner, awkward, clumsy. ΚΠ 1751 Ld. Chesterfield Let. 10 May (1932) (modernized text) IV. 1729 Sir Charles Hotham is gauche; it is to be hoped that will mend with keeping company. 1806 J. Beresford Miseries Human Life I. x. 271 On going early to bed..finding..a gauche dawdle just beginning to introduce the warming-pan between the sheets. 1860 All Year Round 11 Feb. 363 He never does anything ludicrous, or gauche, or intrusive, or fussy, or vulgar. 2. a. Mathematics. Skew, not plane (see quot. 1879). ΚΠ 1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §7 If various points of the line do not lie in one plane, we have in one case..a curve of double curvature, in the other a gauche polygon. b. gauche perspective, that in which the surface of delineation is not a plane. Derivatives ˈgauchely adv. ΚΠ 1891 Broughton & Bisland Widower indeed (1892) iii. 37 He enters gauchely, for he is a cub. ˈgaucheness n. ΚΠ 1883 My Trivial Life II. viii. 164 Never was more astonished than by Lady Arabella's gaucheness. 1936 W. H. Auden Look, Stranger! 55 O can you see precisely in our gaucheness The neighbour's strongest wish, to serve and love? 1937 Discovery July 226/1 Sixty-one excellent plates atone for any ‘gaucheness’ of the style. 1967 M. Wilding in Coast to Coast 1965–6 253 She liked him for his gaucheness. Draft additions 1993 Chemistry. (Frequently italicized.) Characterized by, involving, or designating a staggered molecular conformation in which two particular atoms or groups are positioned in such a way that the dihedral angle between them is approximately 60°; also applied to a part of a molecule which is so positioned with respect to another specified part. Cf. trans- prefix 9a. ΘΚΠ the world > matter > chemistry > chemical structure or stereochemistry > [adjective] > of or relating to conformation gauche1940 conformational1954 1940 Sci. Papers Inst. Physical & Chem. Res. (Tokyo) 37 213 It is probable that such a gauche form is subject to deformation more easily than the trans form which is more symmetrical. 1956 I. L. Finar Org. Chem. II. ii. 31 There are two positions of minimum energy, one corresponding to the trans configuration, and the other to the gauche configuration, the latter possessing approximately 1.1 kg.cal. more than the former. 1975 Nature 16 Oct. 566/2 The phosphorus nucleus giving rise to the highest-field signal shows small ³¹P-O-C-¹H coupling constants (< 5 Hz), consistent only with a conformation in which it is gauche to both 5′ protons. 1976 Lowry & Richardson Mechanism & Theory in Org. Chem. ii. 72 In an alkane, gauche interactions may raise the enthalpy content of the molecule. 1986 M. Rigby et al. Forces between Molecules viii. 187 For hydrocarbons Flory has suggested that A_ij can be estimated from the experimental value of the energy difference between the trans and gauche conformational isomers of the chain. This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2022). < adj.1751
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